After getting a bit overzealous with cleaning up bookmarks in Chrome, I discovered that I deleted a helpful Gerrit filter for OpenStack reviews. I worked hard to create the filter and I definitely needed it back.
Chrome keeps a file called
Bookmarks.bak inside its configuration directory. You can find this file here:
/home/[username]/.config/google-chrome/Default/Bookmarks.bak # If using Chrome stable
/home/[username]/.config/google-chrome-beta/Default/Bookmarks.bak # If using Chrome beta
The file is stored in JSON format. Open it up in your favorite text editor and search for your deleted bookmark.